Abstract: A fire-fighting system in which multiple water discharge lines each have associated with them a foam concentrate delivery line where each of the foam concentrate delivery lines are supplied from a foam concentrate tank by way of a positive displacement pump having the capability of having its flow rate adjusted. Each of the water discharge lines includes a flow meter as do all of the foam concentrate delivery lines. The foam concentrate delivery lines also include a valve whose orifice size is electrically controlled. Associated with each of the foam concentrate delivery lines is a microprocessor-based line controller module that receives inputs from the flow meters in the water discharge lines and the flow meters in the foam concentrate delivery lines whereby the proportion of foam concentrate to water in the separate water discharge lines can be set at predetermined values.

Abstract: In an axial, variable displacement, positive displacement pump having a swash plate mounted on a drive shaft for rotation therewith and a non-rotatable wobble plate surrounding the swash plate but isolated there from through bearings includes a slide mechanism disposed on the shaft that can be axially displaced along the shaft as the shaft is being driven to thereby vary the angle of inclination of the swash plate and wobble plate relative to the drive shaft. The pump further includes a unitary in-line valve assembly including suction and discharge poppet valves for each cylinder whereby the overall diameter of the cylinder block can be minimized.